US6910670B2 - Suspension rubber bushing of vertical mount type - Google Patents

Suspension rubber bushing of vertical mount type Download PDF

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Publication number
US6910670B2
US6910670B2 US10/681,662 US68166203A US6910670B2 US 6910670 B2 US6910670 B2 US 6910670B2 US 68166203 A US68166203 A US 68166203A US 6910670 B2 US6910670 B2 US 6910670B2
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United States
Prior art keywords
rubber
inner sleeve
sleeve
elastic body
axial
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Expired - Fee Related
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US10/681,662
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English (en)
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US20040084601A1 (en
Inventor
Kazuhiko Kato
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Sumitomo Riko Co Ltd
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Sumitomo Riko Co Ltd
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Publication date
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Assigned to TOKAI RUBBER INDUSTRIES, LTD. reassignment TOKAI RUBBER INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, KAZUHIKO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F16F13/16—Units of the bushing type, i.e. loaded predominantly radially specially adapted for receiving axial loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/02—Attaching arms to sprung part of vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
    • F16F1/3807—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type characterised by adaptations for particular modes of stressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/14—Mounting of suspension arms
    • B60G2204/143—Mounting of suspension arms on the vehicle body or chassis
    • B60G2204/1431—Mounting of suspension arms on the vehicle body or chassis of an L-shaped arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/14—Mounting of suspension arms
    • B60G2204/143—Mounting of suspension arms on the vehicle body or chassis
    • B60G2204/1432—Mounting of suspension arms on the vehicle body or chassis by vertical bolts or studs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/41—Elastic mounts, e.g. bushings
    • B60G2204/4104—Bushings having modified rigidity in particular directions
    • B60G2204/41042—Bushings having modified rigidity in particular directions by using internal cam surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/41—Elastic mounts, e.g. bushings
    • B60G2204/4106—Elastokinematic mounts
    • B60G2204/41062—Elastokinematic mounts hydromounts; interconnected mounts

Definitions

  • a suspension rubber bushing (hereinafter simply referred to as a “rubber bushing”) may be disposed at a linkage point between a vehicle body and a control arm in an automobile suspension, in order to ensure turning of the control arm, and to provide vibration damping between the control arm and vehicle body, so that the vehicle body and suspension are elastically linked via the rubber bushing.
  • FIG. 6 illustrates an example of such a suspension system.
  • 200 denotes a tire
  • 202 a control aim having fixing bores 204 disposed at bifurcated front and rear end portions thereof, with a rubber bushing 206 secured press-fit into one of the fixing bores 204 (i.e., the front one).
  • a rubber bushing 206 has an outer metallic sleeve 210 , an inner metallic sleeve 212 , and a rubber elastic body 214 interposed therebetween, elastically connecting the inner and outer sleeves 210 , 212 .
  • This rubber bushing 206 is press fitted at its outer sleeve 210 into the fixing bore 204 , and at its inner sleeve 212 is linked to the vehicle body.
  • the rubber bushing 206 is employed in a horizontal mounting in which a bushing axis is oriented on the horizontal (front-back orientation).
  • the control arm 202 When the tire 200 rises over a bump, the control arm 202 attempts to undergo rotational motion in the direction indicated by arrow P in FIG. 6 . Since the rubber bushing 208 has soft spring characteristics in the direction of input of force applied at this time, and readily deforms in response thereto, thereby providing good moderation of the shock applied to the tire 200 , and effectively damping transmission of shock to the vehicle body.
  • the vertical mount rubber bushing 208 is likely to suffer from a high level of prizing force when the control arm 202 , in association with up and down motion of the tire 200 , rotates up and down about a supporting portion, which is the linkage point of the control arm 202 to the vehicle body by means of the rubber bushing 206 , 208 .
  • prizing force is force oriented so as to tilt the inner sleeve 212 relative to the outer sleeve 210 .
  • the rubber bushing 208 is able to achieve a high level of endurance against applied force based on rotational motion of the control arm 202 in the vertical direction in FIG. 6 , for example, but fails to achieve an intended function due to its spring constant that becomes small in the approximately front-back direction in FIG. 6 . Also, the rubber bushing 208 suffers from appreciable deformation of rubber elastic body 214 when subjected to load in this front-back direction, so that endurance life in this direction declines.
  • a suspension rubber bushing of vertical mount type attachable in a suspension assembly with a bushing axis vertically oriented comprising: an inner sleeve; an outer sleeve disposed about the inner sleeve with a radial spacing therebetween; and a rubber elastic body interposed between and elastically connecting the outer and inner sleeves, wherein the rubber elastic body is formed with a shape, as viewed in vertical cross section in a first direction coincident with a direction of prizing force input, having rubber legs affixed to an axially center portion of the inner sleeve, the rubber legs extending towards mutually opposite axial ends, towards the outer sleeve and away from the inner sleeve so as to form depressed spaces between the rubber legs and the inner sleeve to either axial side of the axially center portion, and as viewed in vertical cross section in a second direction approximately orthogonal to the first direction, having a main body rubber portion thicker than the rubber legs and elastically linking the inner sle
  • first and second fluid chambers are formed at locations to either side of the inner sleeve in the first direction and to the inside of the rubber legs, whereby the walls of the fluid chambers are constituted by the rubber legs, while the first and second fluid chambers are held in fluid communication with each other via the communication passage.
  • the vertical mount rubber bushing can exhibit vibration-damping effect with the help of resonance or flows of the fluid through the communication passage between the first and second fluid chambers.
  • a suspension rubber bushing of vertical mount type attachable in a suspension assembly with a bushing axis vertically oriented comprising: an inner sleeve; an outer sleeve disposed about the inner sleeve with a radial spacing therebetween; and an rubber elastic body interposed between and elastically connecting the outer and inner sleeves, wherein the rubber elastic body is shaped such that, as viewed in vertical cross section in a first direction, an inner bonding surface bonded to the inner sleeve extends with an axial distance La at an axially center portion of the inner sleeve, while an outer bonding surface bonded to the outer sleeve extends with an axial distance Lb that is larger than the axial distance La (La ⁇ Lb) so that the rubber elastic body extends from the axially center portion of the inner sleeve toward the outer sleeve while extending towards mutually opposite axial ends of the outer sleeve, and as viewed in cross section in a second direction approximately orthogonal
  • the rubber elastic body in vertical cross section is shaped such that the rubber elastic body extends from the axially center portion of the inner sleeve toward the outer sleeve while extending towards mutually opposite axial ends of the outer sleeve.
  • the rubber elastic body is bonded to the inner sleeve at a location situated near a pivot of turning or tilt of the inner sleeve relative to the outer sleeve, thereby further minimizing deformation of the rubber elastic body during prizing force input.
  • the outer bonding surface extends with the axial distance Lb that is made larger than the axial distance La of the axial distance of the inner bonding surface (La ⁇ Lb).
  • the rubber elastic body viewed in vertical cross section in the second direction, the inner bonding surface extends with the axial distance Lc that is made larger than the axial distance Ld of the axial distance of the outer bonding surface (Lc>Ld).
  • the rubber bushing can readily exhibit a required spring stiffness with respect to a load applied thereto in the second direction that is approximately coincident with a vehicle front-back direction when attached in the suspension assembly, thus ensuring an excellent drivability.
  • the key is obtaining a sufficient volume at the radially inner side where the circumferential length of the rubber elastic body is naturally small.
  • a suspension rubber bushing according to the above-mentioned mode (3) wherein, as viewed in vertical cross section in the first direction, the inner sleeve includes a projection formed at the axially center portion thereof so as to protrude in opposite radially outward directions, and the inner bonding surface of the rubber elastic body is bonded to the projection such that the projection is embedded within an radially inner portion of the rubber elastic body.
  • This arrangement effectively increasing an area of the inner bonding surface of the rubber elastic body, at which the rubber elastic body is bonded to the inner sleeve, making it possible to reduce local stress concentration at the bonding interface between the inner sleeve and the rubber elastic body, leading to further enhanced durability of the rubber elastic body.
  • the free length of the rubber elastic body is substantially elongated, resulting in further enhanced durability of the rubber bushing.
  • the projection is brought into abutting contact with the outer sleeve member via a rubber buffer for limiting the amount of displacement of the inner sleeve relative to the outer sleeve in a shock absorbing fashion.
  • a suspension rubber bushing according to any one of the above-indicated modes (3)-(8), further comprising a pair of fluid chambers situated, as viewed in vertical cross section in the first direction, to be opposed to each other with the inner sleeve interposed therebetween in one radial direction perpendicular to an axial direction of the inner sleeve, each of the fluid chambers being partially defined by axially opposite side walls formed by the rubber elastic body, and the side walls extending approximately straightly from the inner sleeve towards the outer sleeve, while being spaced away from each other in an axial direction of the bushing.
  • FIG. 2 is a transverse cross sectional view of the rubber bushing of FIG. 1 ;
  • FIG. 4 is a cross sectional view taken along line 4 — 4 of FIG. 2 ;
  • FIGS. 5A and 5B are illustrations for explaining action of the rubber bushing of FIG. 1 in response to prizing force applied thereto.
  • FIG. 6 is an illustration of an exemplary conventional rubber bushing assembled with a suspension
  • FIGS. 1-4 shows a suspension rubber bushing of vertical mount type in the form of a vertical mount rubber bushing 10 constructed according to a presently preferred embodiment of the invention.
  • the vertical mount rubber bushing 10 includes an outer sleeve 12 of metal, an inner sleeve 14 of metal, and a rubber elastic body 16 interposed between and elastically connecting the outer and inner sleeves 12 , 14 .
  • FIG. 3 is a cross sectional view taken along line 3 — 3 of FIG. 2 , i.e., a vertical or axial cross section taken in a first direction coincident with prizing force input direction.
  • the rubber elastic body 16 has a pair of rubber legs 18 , 18 of predetermined wall-thickness, which open out in a “V” configuration on the upper side of the inner sleeve 14 as seen in FIG. 3 .
  • a pair of rubber legs 20 , 20 of predetermined wall-thickness which open out in an inverted “V” configuration on the lower side of the inner sleeve 14 as seen in FIG. 3 .
  • These rubber legs 18 , 20 are of symmetrical shape in the vertical direction in FIG. 3 .
  • the rubber legs 18 are integrally bonded in a process of vulcanization of a rubber material for forming thereof to an axially center portion of the inner sleeve 14 .
  • the rubber legs 18 have a shape extending from the axially center portion towards the axial ends, as well as towards the outer sleeve 12 away from the inner sleeve 14 .
  • a pair of depressed spaces 22 formed between the inner sleeve 14 and the pair of rubber legs 18 , 18 .
  • the rubber legs 20 of inverted “V” configuration on the lower side of the inner sleeve 14 as seen in FIG.
  • the rubber elastic body 16 is bonded at its inner bonding surface to the inner sleeve 14 and at its outer bonding surface to the outer sleeve 12 with a specific shape. Described in detail, the rubber elastic body 16 is shaped such that, as viewed in vertical cross section in the first direction shown in FIG.
  • the inner bonding surface bonded to the inner sleeve 14 extends with an axial distance La at an axially center portion of the inner sleeve 14
  • an outer bonding surface bonded to the outer sleeve 12 extends with an axial distance Lb that is larger than the axial distance La (La ⁇ Lb) so that the rubber elastic body 16 extends from the axially center portion of the inner sleeve 14 toward the outer sleeve 12 while extending towards mutually opposite axial ends of the outer sleeve 12 .
  • a pair of rubber layers 24 , 24 are formed so as to be connected to the rubber legs 18 , 20 , and so as to be integrally bonded by means of vulcanization of a rubber material for forming the rubber layers 24 to the inner sleeve 14 , embedded within a pair of recessed portions 26 , 26 formed on the inner sleeve member 14 .
  • These recessed portions 26 extend with an entire circumference of the inner sleeve member with a substantially constant depth dimension. The provision of the recessed portions 26 is effective to make the free length of the rubber legs 18 , 20 long, and to substantially increase a bonding surface of the rubber legs 18 , 20 with respect to the inner sleeve 14 .
  • the rubber legs 18 situated on the upper side (i.e., the first side) of the inner sleeve 14 as seen in FIG. 3 , cooperate to define therebetween a first fluid chamber 28 , with the rubber legs 18 constituting the walls of the first fluid chamber 28 .
  • the rubber legs 20 situated on the lower side of the inner sleeve 14 as seen in FIG. 3 , cooperate to define therebetween a second fluid chamber 30 , with the rubber legs 20 constituting the walls of the second fluid chamber 30 .
  • FIG. 4 shows a cross sectional shape taken along line 4 — 4 in FIG. 2 , i.e., a vertical section in the second direction approximately orthogonal to the first direction which is the direction of the prizing force input.
  • 44 denotes a main body rubber portion which is the body of the rubber elastic body 16 , and that is thicker than the aforesaid rubber legs 18 , 20 .
  • the main body rubber portions 44 , 44 extend in the lateral directions as seen in FIG. 4 , i.e., the second direction, and connect the inner sleeve 14 and the outer sleeve 12 in this lateral direction as seen in FIG. 4 .
  • the main body rubber portion 44 has a spring constant in the axial orthogonal direction, i.e., lateral direction in FIGS. 2 and 4 , that is greater than the spring constant of the aforementioned rubber legs 18 , 20 in the vertical direction in FIG. 3 .
  • the rubber elastic body 16 is shaped such that, as viewed in cross section in a second direction approximately orthogonal to the first direction shown in FIG. 4 , the rubber elastic body 16 is shaped such that the inner bonding surface extends with an axial distance Lc that is larger than the axial distance La (La ⁇ Lc), while the outer bonding surface extends with an axial distance Ld that is smaller than Lc (Lc>Ld).
  • the shape of the axially exterior face of the main body rubber portions 44 , 44 is an approximately diagonal shape that comes closer to the axial ends, going from the side of the outer sleeve 12 towards the side of the inner sleeve 14 . That is, the main body rubber portions 44 , 44 situated on the left and right sides of the inner sleeve 14 in FIG. 4 are formed with a shape whose axial-direction length gradually increases, going from the side of the outer sleeve 12 towards the side of the inner sleeve.
  • rubber films 46 are connected to and integrally formed with the main body rubber portion 44 of the rubber elastic body 16 . These rubber films are integrally bonded in the process of vulcanization of a rubber material for forming thereof to a center sleeve 48 together with the main body rubber portions 44 .
  • the center sleeve 48 is secured mated with outer sleeve member 12 via a sealing rubber layer 50 of film form.
  • the rubber elastic body 16 and specifically the rubber legs 18 , 20 do not undergo appreciable deformation, even if the inner sleeve 14 should tilt appreciably by angle ⁇ with respect to the outer sleeve 12 due to prizing force input, and thus do not experience appreciable strain.
  • the rubber legs 18 , 20 do not readily reach their fatigue limit, thereby extending endurance life.
  • the main rubber body portions 44 can exhibit excellent spring characteristics.
  • the main rubber body portions 44 have gradually increasing axial-direction length going from the side of the outer sleeve 12 towards the side of the inner sleeve 14 , thus exhibiting enhanced durability against repeated deformation in the lateral direction.
  • the rubber elastic body 16 elastically connects the inner and outer sleeve members 14 , 12
  • the rubber elastic body 16 more specifically the main rubber body portion 44 has an approximately constant axial length in the lateral direction as seen in FIG. 4
  • higher strain and stress would be produced on the side of the inner sleeve 14 , resulting in a tendency to reach fatigue life on the side of the inner sleeve 14
  • the axial length of the main rubber body portions 44 i.e., the thickness of the rubber body portion 44 in the lateral direction is made larger on the side of the inner sleeve 14 where the strength of the rubber elastic body 16 has been deteriorated conventionally.
  • This arrangement makes it possible to avoid production of high levels of strain and stress in the main rubber body portion 44 on the side of the inner sleeve 14 , so that durability is enhanced when main rubber body portion 44 is subjected to repeated deformation in the lateral, axial-orthogonal direction in FIG. 4 .
  • the first and second fluid chambers 28 , 30 and the communication passage 32 for permitting a fluid communication between these chambers 28 , 30 are not essential to practice the present invention.
  • the rubber elastic body as viewed in vertical cross section in the first direction may have a void that is filled with an air rather than liquid, or alternatively may have a solid body.
  • the projection in the form of the metallic stoppers 34 , 35 may have a variety of forms including a rounded shape.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Vehicle Body Suspensions (AREA)
US10/681,662 2002-10-30 2003-10-07 Suspension rubber bushing of vertical mount type Expired - Fee Related US6910670B2 (en)

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JP2002316698A JP2004150537A (ja) 2002-10-30 2002-10-30 縦置式のサスペンションゴムブッシュ
JP2002-316698 2002-10-30

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Cited By (12)

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US20060006592A1 (en) * 2004-07-08 2006-01-12 Tokai Rubber Industries, Ltd. Fluid-filled vibration damping bushing
US20060131801A1 (en) * 2004-11-29 2006-06-22 Barickman James R Vehicle cab suspension damping bushing and method of making
US20090072454A1 (en) * 2006-04-21 2009-03-19 Trelleborg Automotive Technical Centre Gmbh Air-Damped Mounting Bush
US20090151597A1 (en) * 2007-12-17 2009-06-18 Pierre Pic Slotted joint for a drive link
US20100086377A1 (en) * 2008-10-04 2010-04-08 De Mola Manuel Loret Vibration isolation fastener insert
US20100213651A1 (en) * 2009-02-26 2010-08-26 Tokai Rubber Industries, Ltd. Fluid-filled cylindrical vibration-damping device
US8444158B2 (en) 2010-06-30 2013-05-21 Diversified Machine, Inc. Knuckle and bushing assembly
US9140279B2 (en) 2012-09-25 2015-09-22 The Young Engineers, Inc. Magnetic mount
US20180154720A1 (en) * 2016-12-02 2018-06-07 Ford Global Technologies, Llc Transverse link for a wheel suspension of a vehicle and method for the production thereof
US20190195305A1 (en) * 2017-12-13 2019-06-27 Robert Bosch Gmbh Haltevorrichtung
US10792968B2 (en) 2017-05-10 2020-10-06 Hyundai Motor Company Double compression ratio type bush and suspension system thereby
US11434974B2 (en) * 2019-07-22 2022-09-06 Sumitomo Riko Company Limited Vibration absorber and method for producing a vibration absorber

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DE102008061833A1 (de) 2008-12-11 2010-06-24 Zf Friedrichshafen Ag Querlenker eines Kraftfahrzeuges
DE102009006356B4 (de) 2009-01-28 2012-04-26 Zf Friedrichshafen Ag Querlenker eines Kraftfahrzeuges
DE102012014318B4 (de) * 2012-07-19 2016-10-20 Anvis Deutschland Gmbh Federfunktionsbauteil für ein hydroelastisches Lager und hydroelastisches Lager
CN102829113A (zh) * 2012-09-24 2012-12-19 广西柳工机械股份有限公司 滚筒式减震悬置装置
JP6190638B2 (ja) * 2013-06-27 2017-08-30 住友理工株式会社 防振ブッシュおよび防振ブッシュの製造方法
JP6349114B2 (ja) * 2014-03-12 2018-06-27 山下ゴム株式会社 液封式防振装置
JP2016065558A (ja) * 2014-09-23 2016-04-28 東洋ゴム工業株式会社 液封入式防振装置
JP2016065556A (ja) * 2014-09-23 2016-04-28 東洋ゴム工業株式会社 液封入式防振装置
FR3045501B1 (fr) * 2015-12-22 2019-03-29 Psa Automobiles Sa. Train de roues d’un vehicule
CN107364463B (zh) * 2017-07-26 2023-05-26 株洲时代新材料科技股份有限公司 牵引拉杆节点的橡胶型面设计方法及牵引拉杆节点

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US4717111A (en) * 1984-09-07 1988-01-05 Tokai Rubber Industries, Ltd. Fluid-filled resilient engine mount
US4834351A (en) * 1987-05-21 1989-05-30 Freudenberg Carl Fa Rubber sleeve spring
US4883260A (en) * 1987-09-16 1989-11-28 Tokai Rubber Industries, Ltd. Elastic bushing having fluid chamber filled with highly viscous fluid
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